stringprep.map_table_b2() deviates from RFC 3454 Table B.2
The "stringprep" module didn't process characters from RFC 3454 tables B.2 or B.3 correctly: the latest Unicode codepoint attributes were used instead of the specified Unicode 3.2.0. This behavior would cause mismatches when processing domain names using IDNA 2003 (the "idna" codec) and the in_table_b2() function of the "stringprep" module. This only affects domain names containing characters that were not previously registered or had their Unicode attributes such as case-folding behavior updated since Unicode 3.2.0.
CVE-2026-17084
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-17084
CPython
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://github.com/python/cpython",
"vendor": "Python Software Foundation",
"modules": [
"stringprep",
"idna"
],
"product": "CPython",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "3.10.22",
"versionType": "python"
},
{
"status": "affected",
"version": "3.11.0",
"lessThan": "3.11.17",
"versionType": "python"
},
{
"status": "affected",
"version": "3.12.0",
"lessThan": "3.12.15",
"versionType": "python"
},
{
"status": "affected",
"version": "3.13.0",
"lessThan": "3.13.16",
"versionType": "python"
},
{
"status": "affected",
"version": "3.14.0",
"lessThan": "3.14.8",
"versionType": "python"
},
{
"status": "affected",
"version": "3.15.0a1",
"lessThan": "3.15.0rc2",
"versionType": "python"
}
],
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-17084
Source reference:
/cveMetadata/cveId
Publisher severity
medium
Source reference: /containers/cna/metrics
- Event
- #7815 · Revision 1
- Added to Heist Feed
- Publisher date